feat(core): add page width property (#8775)

close AF-1655

tests/affine-local/e2e/page-properties.spec.ts

@@ -130,6 +130,7 @@ test('property table reordering', async ({ page }) => {
     'Updated',
     'Created by',
     'Edgeless theme',
+    'Page width',
     'Number',
     'Date',
     'Checkbox',
@@ -174,6 +175,7 @@ test('page info show more will show all properties', async ({ page }) => {
     'Updated',
     'Created by',
     'Edgeless theme',
+    'Page width',
     'Text',
     'Number',
     'Date',